Working Principle:
A noble metal thermocouple operates based on the Seebeck effect, where a voltage is generated when two dissimilar metals (e.g., Platinum and Platinum-Rhodium) are joined at one end and subjected to a temperature gradient. The resulting thermoelectric voltage is directly related to the temperature difference, allowing precise measurement of high temperatures.
The thermoelectric EMF is measured and interpreted using standard thermocouple tables (per IEC or ANSI), with cold junction compensation applied by the measurement system.
Materials:
- Thermocouple Wires:
- Type S: Platinum (Pt) vs. Platinum-Rhodium 10% (Pt-Rh10%)
- Type R: Platinum vs. Platinum-Rhodium 13% (Pt-Rh13%)
- Type B: Platinum-Rhodium 6% (Pt-Rh6%) vs. Platinum-Rhodium 30% (Pt-Rh30%)
- Insulation:
- High-purity alumina (Al₂O₃) ceramic tubes or beads
- Optional: double bore insulators for higher mechanical and thermal strength
- Protective Sheath (optional):
- Platinum, platinum-coated ceramic, or high-grade silicon carbide
- Used to prevent contamination and extend service life
- Terminal Assembly:
- Nickel or stainless steel terminal block with ceramic heads
Applications:
- Metallurgical Industry:
For monitoring melting, casting, and heat treatment of steel, aluminum, copper, and other metals. - Glass and Ceramic Industry:
Temperature control in furnaces and kilns requiring precise heat regulation. - Semiconductor Industry:
Cleanroom and high-purity environments needing non-contaminating sensors. - Aerospace and Defense:
Engine testing, materials research, and high-temperature component validation. - Scientific Research and Laboratories:
High-accuracy, stable temperature measurement in controlled experiments.
Product Features:
- Measurement Range: Up to 1800°C (varies by type)
- High Accuracy and Stability: Class I or special tolerances available
- Exceptional Chemical Resistance: Suitable for oxidizing and inert atmospheres
- Long-Term Durability: Noble metals ensure longer lifespan in extreme heat
- Customizable Structure: Can be tailored with single or double protection tubes, various mounting flanges, and connection heads